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const {
ArrayIsArray,
ArrayPrototypePush,
Boolean,
FunctionPrototypeBind,
ObjectAssign,
ObjectCreate,
ObjectKeys,
ObjectPrototypeHasOwnProperty,
Proxy,
ReflectApply,
ReflectGetPrototypeOf,
StringPrototypeIncludes,
SafeArrayIterator,
StringPrototypeToLowerCase,
StringPrototypeTrim,
Symbol,
} = primordials;
const assert = require('internal/assert');
const Stream = require('stream');
const { Readable } = Stream;
const {
constants: {
HTTP2_HEADER_AUTHORITY,
HTTP2_HEADER_CONNECTION,
HTTP2_HEADER_METHOD,
HTTP2_HEADER_PATH,
HTTP2_HEADER_SCHEME,
HTTP2_HEADER_STATUS,
HTTP_STATUS_CONTINUE,
HTTP_STATUS_EXPECTATION_FAILED,
HTTP_STATUS_METHOD_NOT_ALLOWED,
HTTP_STATUS_OK
}
} = internalBinding('http2');
const {
codes: {
ERR_HTTP2_HEADERS_SENT,
ERR_HTTP2_INFO_STATUS_NOT_ALLOWED,
ERR_HTTP2_INVALID_HEADER_VALUE,
ERR_HTTP2_INVALID_STREAM,
ERR_HTTP2_NO_SOCKET_MANIPULATION,
ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED,
ERR_HTTP2_STATUS_INVALID,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_HTTP_TOKEN,
ERR_STREAM_WRITE_AFTER_END
},
hideStackFrames
} = require('internal/errors');
const {
validateFunction,
validateString,
} = require('internal/validators');
const {
kSocket,
kRequest,
kProxySocket,
assertValidPseudoHeader,
getAuthority
} = require('internal/http2/util');
const { _checkIsHttpToken: checkIsHttpToken } = require('_http_common');
const kBeginSend = Symbol('begin-send');
const kState = Symbol('state');
const kStream = Symbol('stream');
const kResponse = Symbol('response');
const kHeaders = Symbol('headers');
const kRawHeaders = Symbol('rawHeaders');
const kTrailers = Symbol('trailers');
const kRawTrailers = Symbol('rawTrailers');
const kSetHeader = Symbol('setHeader');
const kAborted = Symbol('aborted');
let statusMessageWarned = false;
let statusConnectionHeaderWarned = false;
// Defines and implements an API compatibility layer on top of the core
// HTTP/2 implementation, intended to provide an interface that is as
// close as possible to the current require('http') API
const assertValidHeader = hideStackFrames((name, value) => {
if (name === '' ||
typeof name !== 'string' ||
StringPrototypeIncludes(name, ' ')) {
throw new ERR_INVALID_HTTP_TOKEN('Header name', name);
}
if (isPseudoHeader(name)) {
throw new ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED();
}
if (value === undefined || value === null) {
throw new ERR_HTTP2_INVALID_HEADER_VALUE(value, name);
}
if (!isConnectionHeaderAllowed(name, value)) {
connectionHeaderMessageWarn();
}
});
function isPseudoHeader(name) {
switch (name) {
case HTTP2_HEADER_STATUS: // :status
case HTTP2_HEADER_METHOD: // :method
case HTTP2_HEADER_PATH: // :path
case HTTP2_HEADER_AUTHORITY: // :authority
case HTTP2_HEADER_SCHEME: // :scheme
return true;
default:
return false;
}
}
function statusMessageWarn() {
if (statusMessageWarned === false) {
process.emitWarning(
'Status message is not supported by HTTP/2 (RFC7540 8.1.2.4)',
'UnsupportedWarning'
);
statusMessageWarned = true;
}
}
function isConnectionHeaderAllowed(name, value) {
return name !== HTTP2_HEADER_CONNECTION ||
value === 'trailers';
}
function connectionHeaderMessageWarn() {
if (statusConnectionHeaderWarned === false) {
process.emitWarning(
'The provided connection header is not valid, ' +
'the value will be dropped from the header and ' +
'will never be in use.',
'UnsupportedWarning'
);
statusConnectionHeaderWarned = true;
}
}
function onStreamData(chunk) {
const request = this[kRequest];
if (request !== undefined && !request.push(chunk))
this.pause();
}
function onStreamTrailers(trailers, flags, rawTrailers) {
const request = this[kRequest];
if (request !== undefined) {
ObjectAssign(request[kTrailers], trailers);
ArrayPrototypePush(request[kRawTrailers],
...new SafeArrayIterator(rawTrailers));
}
}
function onStreamEnd() {
// Cause the request stream to end as well.
const request = this[kRequest];
if (request !== undefined)
this[kRequest].push(null);
}
function onStreamError(error) {
// This is purposefully left blank
//
// errors in compatibility mode are
// not forwarded to the request
// and response objects.
}
function onRequestPause() {
this[kStream].pause();
}
function onRequestResume() {
this[kStream].resume();
}
function onStreamDrain() {
const response = this[kResponse];
if (response !== undefined)
response.emit('drain');
}
function onStreamAbortedRequest() {
const request = this[kRequest];
if (request !== undefined && request[kState].closed === false) {
request[kAborted] = true;
request.emit('aborted');
}
}
function onStreamAbortedResponse() {
// non-op for now
}
function resumeStream(stream) {
stream.resume();
}
const proxySocketHandler = {
has(stream, prop) {
const ref = stream.session !== undefined ? stream.session[kSocket] : stream;
return (prop in stream) || (prop in ref);
},
get(stream, prop) {
switch (prop) {
case 'on':
case 'once':
case 'end':
case 'emit':
case 'destroy':
return FunctionPrototypeBind(stream[prop], stream);
case 'writable':
case 'destroyed':
return stream[prop];
case 'readable': {
if (stream.destroyed)
return false;
const request = stream[kRequest];
return request ? request.readable : stream.readable;
}
case 'setTimeout': {
const session = stream.session;
if (session !== undefined)
return FunctionPrototypeBind(session.setTimeout, session);
return FunctionPrototypeBind(stream.setTimeout, stream);
}
case 'write':
case 'read':
case 'pause':
case 'resume':
throw new ERR_HTTP2_NO_SOCKET_MANIPULATION();
default: {
const ref = stream.session !== undefined ?
stream.session[kSocket] : stream;
const value = ref[prop];
return typeof value === 'function' ?
FunctionPrototypeBind(value, ref) :
value;
}
}
},
getPrototypeOf(stream) {
if (stream.session !== undefined)
return ReflectGetPrototypeOf(stream.session[kSocket]);
return ReflectGetPrototypeOf(stream);
},
set(stream, prop, value) {
switch (prop) {
case 'writable':
case 'readable':
case 'destroyed':
case 'on':
case 'once':
case 'end':
case 'emit':
case 'destroy':
stream[prop] = value;
return true;
case 'setTimeout': {
const session = stream.session;
if (session !== undefined)
session.setTimeout = value;
else
stream.setTimeout = value;
return true;
}
case 'write':
case 'read':
case 'pause':
case 'resume':
throw new ERR_HTTP2_NO_SOCKET_MANIPULATION();
default: {
const ref = stream.session !== undefined ?
stream.session[kSocket] : stream;
ref[prop] = value;
return true;
}
}
}
};
function onStreamCloseRequest() {
const req = this[kRequest];
if (req === undefined)
return;
const state = req[kState];
state.closed = true;
req.push(null);
// If the user didn't interact with incoming data and didn't pipe it,
// dump it for compatibility with http1
if (!state.didRead && !req._readableState.resumeScheduled)
req.resume();
this[kProxySocket] = null;
this[kRequest] = undefined;
req.emit('close');
}
function onStreamTimeout(kind) {
return function onStreamTimeout() {
const obj = this[kind];
obj.emit('timeout');
};
}
class Http2ServerRequest extends Readable {
constructor(stream, headers, options, rawHeaders) {
super({ autoDestroy: false, ...options });
this[kState] = {
closed: false,
didRead: false,
};
// Headers in HTTP/1 are not initialized using Object.create(null) which,
// although preferable, would simply break too much code. Ergo header
// initialization using Object.create(null) in HTTP/2 is intentional.
this[kHeaders] = headers;
this[kRawHeaders] = rawHeaders;
this[kTrailers] = {};
this[kRawTrailers] = [];
this[kStream] = stream;
this[kAborted] = false;
stream[kProxySocket] = null;
stream[kRequest] = this;
// Pause the stream..
stream.on('trailers', onStreamTrailers);
stream.on('end', onStreamEnd);
stream.on('error', onStreamError);
stream.on('aborted', onStreamAbortedRequest);
stream.on('close', onStreamCloseRequest);
stream.on('timeout', onStreamTimeout(kRequest));
this.on('pause', onRequestPause);
this.on('resume', onRequestResume);
}
get aborted() {
return this[kAborted];
}
get complete() {
return this[kAborted] ||
this.readableEnded ||
this[kState].closed ||
this[kStream].destroyed;
}
get stream() {
return this[kStream];
}
get headers() {
return this[kHeaders];
}
get rawHeaders() {
return this[kRawHeaders];
}
get trailers() {
return this[kTrailers];
}
get rawTrailers() {
return this[kRawTrailers];
}
get httpVersionMajor() {
return 2;
}
get httpVersionMinor() {
return 0;
}
get httpVersion() {
return '2.0';
}
get socket() {
const stream = this[kStream];
const proxySocket = stream[kProxySocket];
if (proxySocket === null)
return stream[kProxySocket] = new Proxy(stream, proxySocketHandler);
return proxySocket;
}
get connection() {
return this.socket;
}
_read(nread) {
const state = this[kState];
assert(!state.closed);
if (!state.didRead) {
state.didRead = true;
this[kStream].on('data', onStreamData);
} else {
process.nextTick(resumeStream, this[kStream]);
}
}
get method() {
return this[kHeaders][HTTP2_HEADER_METHOD];
}
set method(method) {
validateString(method, 'method');
if (StringPrototypeTrim(method) === '')
throw new ERR_INVALID_ARG_VALUE('method', method);
this[kHeaders][HTTP2_HEADER_METHOD] = method;
}
get authority() {
return getAuthority(this[kHeaders]);
}
get scheme() {
return this[kHeaders][HTTP2_HEADER_SCHEME];
}
get url() {
return this[kHeaders][HTTP2_HEADER_PATH];
}
set url(url) {
this[kHeaders][HTTP2_HEADER_PATH] = url;
}
setTimeout(msecs, callback) {
if (!this[kState].closed)
this[kStream].setTimeout(msecs, callback);
return this;
}
}
function onStreamTrailersReady() {
this.sendTrailers(this[kResponse][kTrailers]);
}
function onStreamCloseResponse() {
const res = this[kResponse];
if (res === undefined)
return;
const state = res[kState];
if (this.headRequest !== state.headRequest)
return;
state.closed = true;
this[kProxySocket] = null;
this.removeListener('wantTrailers', onStreamTrailersReady);
this[kResponse] = undefined;
res.emit('finish');
res.emit('close');
}
class Http2ServerResponse extends Stream {
constructor(stream, options) {
super(options);
this[kState] = {
closed: false,
ending: false,
destroyed: false,
headRequest: false,
sendDate: true,
statusCode: HTTP_STATUS_OK,
};
this[kHeaders] = ObjectCreate(null);
this[kTrailers] = ObjectCreate(null);
this[kStream] = stream;
stream[kProxySocket] = null;
stream[kResponse] = this;
this.writable = true;
this.req = stream[kRequest];
stream.on('drain', onStreamDrain);
stream.on('aborted', onStreamAbortedResponse);
stream.on('close', onStreamCloseResponse);
stream.on('wantTrailers', onStreamTrailersReady);
stream.on('timeout', onStreamTimeout(kResponse));
}
// User land modules such as finalhandler just check truthiness of this
// but if someone is actually trying to use this for more than that
// then we simply can't support such use cases
get _header() {
return this.headersSent;
}
get writableEnded() {
const state = this[kState];
return state.ending;
}
get finished() {
const state = this[kState];
return state.ending;
}
get socket() {
// This is compatible with http1 which removes socket reference
// only from ServerResponse but not IncomingMessage
if (this[kState].closed)
return undefined;
const stream = this[kStream];
const proxySocket = stream[kProxySocket];
if (proxySocket === null)
return stream[kProxySocket] = new Proxy(stream, proxySocketHandler);
return proxySocket;
}
get connection() {
return this.socket;
}
get stream() {
return this[kStream];
}
get headersSent() {
return this[kStream].headersSent;
}
get sendDate() {
return this[kState].sendDate;
}
set sendDate(bool) {
this[kState].sendDate = Boolean(bool);
}
get statusCode() {
return this[kState].statusCode;
}
get writableCorked() {
return this[kStream].writableCorked;
}
get writableHighWaterMark() {
return this[kStream].writableHighWaterMark;
}
get writableFinished() {
return this[kStream].writableFinished;
}
get writableLength() {
return this[kStream].writableLength;
}
set statusCode(code) {
code |= 0;
if (code >= 100 && code < 200)
throw new ERR_HTTP2_INFO_STATUS_NOT_ALLOWED();
if (code < 100 || code > 599)
throw new ERR_HTTP2_STATUS_INVALID(code);
this[kState].statusCode = code;
}
setTrailer(name, value) {
validateString(name, 'name');
name = StringPrototypeToLowerCase(StringPrototypeTrim(name));
assertValidHeader(name, value);
this[kTrailers][name] = value;
}
addTrailers(headers) {
const keys = ObjectKeys(headers);
let key = '';
for (let i = 0; i < keys.length; i++) {
key = keys[i];
this.setTrailer(key, headers[key]);
}
}
getHeader(name) {
validateString(name, 'name');
name = StringPrototypeToLowerCase(StringPrototypeTrim(name));
return this[kHeaders][name];
}
getHeaderNames() {
return ObjectKeys(this[kHeaders]);
}
getHeaders() {
const headers = ObjectCreate(null);
return ObjectAssign(headers, this[kHeaders]);
}
hasHeader(name) {
validateString(name, 'name');
name = StringPrototypeToLowerCase(StringPrototypeTrim(name));
return ObjectPrototypeHasOwnProperty(this[kHeaders], name);
}
removeHeader(name) {
validateString(name, 'name');
if (this[kStream].headersSent)
throw new ERR_HTTP2_HEADERS_SENT();
name = StringPrototypeToLowerCase(StringPrototypeTrim(name));
if (name === 'date') {
this[kState].sendDate = false;
return;
}
delete this[kHeaders][name];
}
setHeader(name, value) {
validateString(name, 'name');
if (this[kStream].headersSent)
throw new ERR_HTTP2_HEADERS_SENT();
this[kSetHeader](name, value);
}
[kSetHeader](name, value) {
name = StringPrototypeToLowerCase(StringPrototypeTrim(name));
assertValidHeader(name, value);
if (!isConnectionHeaderAllowed(name, value)) {
return;
}
if (name[0] === ':')
assertValidPseudoHeader(name);
else if (!checkIsHttpToken(name))
this.destroy(new ERR_INVALID_HTTP_TOKEN('Header name', name));
this[kHeaders][name] = value;
}
get statusMessage() {
statusMessageWarn();
return '';
}
set statusMessage(msg) {
statusMessageWarn();
}
flushHeaders() {
const state = this[kState];
if (!state.closed && !this[kStream].headersSent)
this.writeHead(state.statusCode);
}
writeHead(statusCode, statusMessage, headers) {
const state = this[kState];
if (state.closed || this.stream.destroyed)
return this;
if (this[kStream].headersSent)
throw new ERR_HTTP2_HEADERS_SENT();
if (typeof statusMessage === 'string')
statusMessageWarn();
if (headers === undefined && typeof statusMessage === 'object')
headers = statusMessage;
let i;
if (ArrayIsArray(headers)) {
if (headers.length && ArrayIsArray(headers[0])) {
for (i = 0; i < headers.length; i++) {
const header = headers[i];
this[kSetHeader](header[0], header[1]);
}
} else {
if (headers.length % 2 !== 0) {
throw new ERR_INVALID_ARG_VALUE('headers', headers);
}
for (i = 0; i < headers.length; i += 2) {
this[kSetHeader](headers[i], headers[i + 1]);
}
}
} else if (typeof headers === 'object') {
const keys = ObjectKeys(headers);
let key = '';
for (i = 0; i < keys.length; i++) {
key = keys[i];
this[kSetHeader](key, headers[key]);
}
}
state.statusCode = statusCode;
this[kBeginSend]();
return this;
}
cork() {
this[kStream].cork();
}
uncork() {
this[kStream].uncork();
}
write(chunk, encoding, cb) {
const state = this[kState];
if (typeof encoding === 'function') {
cb = encoding;
encoding = 'utf8';
}
let err;
if (state.ending) {
err = new ERR_STREAM_WRITE_AFTER_END();
} else if (state.closed) {
err = new ERR_HTTP2_INVALID_STREAM();
} else if (state.destroyed) {
return false;
}
if (err) {
if (typeof cb === 'function')
process.nextTick(cb, err);
this.destroy(err);
return false;
}
const stream = this[kStream];
if (!stream.headersSent)
this.writeHead(state.statusCode);
return stream.write(chunk, encoding, cb);
}
end(chunk, encoding, cb) {
const stream = this[kStream];
const state = this[kState];
if (typeof chunk === 'function') {
cb = chunk;
chunk = null;
} else if (typeof encoding === 'function') {
cb = encoding;
encoding = 'utf8';
}
if ((state.closed || state.ending) &&
state.headRequest === stream.headRequest) {
if (typeof cb === 'function') {
process.nextTick(cb);
}
return this;
}
if (chunk !== null && chunk !== undefined)
this.write(chunk, encoding);
state.headRequest = stream.headRequest;
state.ending = true;
if (typeof cb === 'function') {
if (stream.writableEnded)
this.once('finish', cb);
else
stream.once('finish', cb);
}
if (!stream.headersSent)
this.writeHead(this[kState].statusCode);
if (this[kState].closed || stream.destroyed)
ReflectApply(onStreamCloseResponse, stream, []);
else
stream.end();
return this;
}
destroy(err) {
if (this[kState].destroyed)
return;
this[kState].destroyed = true;
this[kStream].destroy(err);
}
setTimeout(msecs, callback) {
if (this[kState].closed)
return;
this[kStream].setTimeout(msecs, callback);
}
createPushResponse(headers, callback) {
validateFunction(callback, 'callback');
if (this[kState].closed) {
process.nextTick(callback, new ERR_HTTP2_INVALID_STREAM());
return;
}
this[kStream].pushStream(headers, {}, (err, stream, headers, options) => {
if (err) {
callback(err);
return;
}
callback(null, new Http2ServerResponse(stream));
});
}
[kBeginSend]() {
const state = this[kState];
const headers = this[kHeaders];
headers[HTTP2_HEADER_STATUS] = state.statusCode;
const options = {
endStream: state.ending,
waitForTrailers: true,
sendDate: state.sendDate
};
this[kStream].respond(headers, options);
}
// TODO doesn't support callbacks
writeContinue() {
const stream = this[kStream];
if (stream.headersSent || this[kState].closed)
return false;
stream.additionalHeaders({
[HTTP2_HEADER_STATUS]: HTTP_STATUS_CONTINUE
});
return true;
}
}
function onServerStream(ServerRequest, ServerResponse,
stream, headers, flags, rawHeaders) {
const server = this;
const request = new ServerRequest(stream, headers, undefined, rawHeaders);
const response = new ServerResponse(stream);
// Check for the CONNECT method
const method = headers[HTTP2_HEADER_METHOD];
if (method === 'CONNECT') {
if (!server.emit('connect', request, response)) {
response.statusCode = HTTP_STATUS_METHOD_NOT_ALLOWED;
response.end();
}
return;
}
// Check for Expectations
if (headers.expect !== undefined) {
if (headers.expect === '100-continue') {
if (server.listenerCount('checkContinue')) {
server.emit('checkContinue', request, response);
} else {
response.writeContinue();
server.emit('request', request, response);
}
} else if (server.listenerCount('checkExpectation')) {
server.emit('checkExpectation', request, response);
} else {
response.statusCode = HTTP_STATUS_EXPECTATION_FAILED;
response.end();
}
return;
}
server.emit('request', request, response);
}
module.exports = {
onServerStream,
Http2ServerRequest,
Http2ServerResponse,
};
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